No valid host port pairs specified for setting – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-6.8

Briefly, this error occurs when Elasticsearch is unable to find a valid host:port pair in the configuration settings. This could be due to incorrect syntax, missing values, or invalid IP addresses or port numbers. To resolve this issue, you should first verify the syntax and format of your configuration file. Ensure that the host:port pairs are correctly specified and separated by commas. Also, check that the IP addresses and port numbers are valid and accessible. If you’re using environment variables, make sure they are correctly defined and accessible.

This guide will help you check for common problems that cause the log ” no valid host:port pairs specified for setting [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, plugin.

Log Context

Log “no valid host:port pairs specified for setting [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 hostPortPairs.add(new Tuple<>(hostPort.get(0); hostPort.size() == 2 ? Integer.valueOf(hostPort.get(1)) : 9300));
 }  if (hostPortPairs.size() == 0) {
 throw new ElasticsearchException("no valid host:port pairs specified for setting ["
 + REMOTE_CLIENT_SETTINGS.getKey() + ".hosts]");
 final Settings theClientSetting =
 .put(clientSettings.filter((s) -> s.startsWith("hosts") == false)) // hosts is not a valid setting